Writing about work offer (7)
I believe the answer is:
propose
'offer' is the definition.
(I've seen this before)
'writing about work' is the wordplay.
'writing' becomes 'prose' (I've seen this in other clues).
'about' means one lot of letters goes inside another.
'work' becomes 'op' (abbreviation for opus).
'prose' enclosing 'op' is 'PROPOSE'.
(Other definitions for propose that I've seen before include "table" , "Suggest - make an offer" , "Present for consideration" , "Pop the question" , "Request" .)